Kayliereinkingh Kayliereinkingh

04-05-2017
Mathematics

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The exact area of a circle is 81 pi square inches what are the radius and diameter of the circle

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greenie269 greenie269

07-05-2017

A=81pi
Since the formula for area is A=pi*r^2, you know that 81 was their "squared" answer.
Take the sq. rt. of 81, which is 9. this is your radius.
Diameter is always double your radius. 9+9=18.

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